Planning one space at a time is easier than shopping aisle by aisle. Pick the room you are working on and we will pull together the departments it draws from, from the structural work through to the fixtures and the final coat of paint.
Working room by room
Start with what cannot move: plumbing rough-ins, electrical runs, and anything structural. Order those first, because everything else is scheduled around them. Finishes, fittings and decor come last and are the easiest to change your mind about.
If part of the job needs a licensed trade, post it and compare offers from vetted local providers. You can buy the materials here and have someone else fit them.